如何在Android中使用散点图?
此示例演示如何在Android中使用散点图。
步骤1 - 在Android Studio中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建新项目。
步骤2 - 打开build.gradle(模块级)并添加库依赖项。
apply plugin: 'com.android.application' android { packagingOptions { exclude 'META-INF/proguard/androidx-annotations.pro' } packagingOptions { exclude 'META-INF/DEPENDENCIES' exclude 'META-INF/LICENSE' exclude 'META-INF/LICENSE.txt' exclude 'META-INF/license.txt' exclude 'META-INF/NOTICE' exclude 'META-INF/NOTICE.txt' exclude 'META-INF/notice.txt' exclude 'META-INF/ASL2.0' } compileSdkVersion 28 defaultConfig { applicationId "com.example.andy.myapplication" minSdkVersion 15 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support.constraint:constraint-layout:1.1.3' implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' }
步骤3 - 打开build.gradle(应用程序级)并添加库依赖项。
// Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.2.1' // NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files } } allprojects { repositories { google() jcenter() maven { url 'https://jitpack.io' } } } task clean(type: Delete) { delete rootProject.buildDir }
步骤4 - 将以下代码添加到res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity"> <com.github.mikephil.charting.charts.ScatterChart android:id = "@+id/scatterChart" android:layout_width = "fill_parent" android:layout_height = "fill_parent" /> </android.support.constraint.ConstraintLayout>
在上面的代码中,我们使用了散点图视图来显示散点图。
步骤4 - 将以下代码添加到src/MainActivity.java
package com.example.andy.myapplication; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import com.github.mikephil.charting.charts.ScatterChart; import com.github.mikephil.charting.data.BarEntry; import com.github.mikephil.charting.data.ScatterData; import com.github.mikephil.charting.data.ScatterDataSet; import com.github.mikephil.charting.utils.ColorTemplate; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { ScatterChart scatterChart; ScatterData scatterData; ScatterDataSet scatterDataSet; ArrayList scatterEntries; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); scatterChart = findViewById(R.id.scatterChart); getEntries(); scatterDataSet = new ScatterDataSet(scatterEntries, ""); scatterData = new ScatterData(scatterDataSet); scatterChart.setData(scatterData); scatterDataSet.setColors(ColorTemplate.JOYFUL_COLORS); scatterDataSet.setValueTextColor(Color.BLACK); scatterDataSet.setValueTextSize(18f); } private void getEntries() { scatterEntries = new ArrayList<>(); scatterEntries.add(new BarEntry(2f, 0)); scatterEntries.add(new BarEntry(4f, 1)); scatterEntries.add(new BarEntry(6f, 1)); scatterEntries.add(new BarEntry(8f, 3)); scatterEntries.add(new BarEntry(7f, 4)); scatterEntries.add(new BarEntry(3f, 3)); } }
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序,请打开项目的某个活动文件,然后单击运行 工具栏中的图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 -
在上面的结果中,它根据我们的数据集值显示散点图。
点击 这里 下载项目代码
广告